991013013002 has 4 divisors (see below), whose sum is σ = 1486519519506. Its totient is φ = 495506506500.

The previous prime is 991013012999. The next prime is 991013013037. The reversal of 991013013002 is 200310310199.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 634796221081 + 356216791921 = 796741^2 + 596839^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247753253249 + ... + 247753253252.

Almost surely, 2^991013013002 is an apocalyptic number.

991013013002 is a deficient number, since it is larger than the sum of its proper divisors (495506506504).

991013013002 is a wasteful number, since it uses less digits than its factorization.

991013013002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495506506503.

The product of its (nonzero) digits is 1458, while the sum is 29.

The spelling of 991013013002 in words is "nine hundred ninety-one billion, thirteen million, thirteen thousand, two".